Answer
$\dfrac{1}{y^{4}}$
Work Step by Step
Using the laws of exponents, the given expression, $
y^{-5}\cdot y
$, is equivalent to
\begin{array}{l}
y^{-5+1}
\\\\=
y^{-4}
\\\\=
\dfrac{1}{y^{4}}
.\end{array}
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